Pump jack



0. CULLMAN.

PUMP JACK. APPLICATION FILED 001.26, 1921.

7 1,414,936. Pa tented May 2 2, 1922.

hl i tilafial Start ing OTTO CULLMAN, OF CHICAGO, ILLINOIS.

PUMP JACK.

naiaeae;

Application filed October 26, 1921.

To all whom it may concern:

Be it known that I, OTTO CULLMAN, a citizen of the United States, and a resident of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Pump Jacks, of which the following is a specification.

This invention relates to devices known in the trade as pump jacks, which are used to operate the rods of pumps, to obtain the delivery of water therefrom. 7

Among the objects of this invention is to obtain a pump jack which is operable by an electric motor at all seasons of the year, and which requires no dismantling thereof while the same is out of' use; to obtain a pump jack of the kind described which is operable with what is known as a house electric current, that is a current of the voltage used for energizing the electric lamps installed in houses, barns and other buildings; additional objects are to obtain a pump jack which will not produce vibrations of the pipe of an ordinary drlven or deep well pump, and which can be installed by an ordinary mechanic.

In the drawing accompanying and forming a part of this specification I have illus trated a construction which embodies the invention, in which drawing- Fig. l is a vertical section, on line 11 of Fig. 2, viewed as indicated by arrows;

Fig. 2 is a vertical section on line 2-2 of Fig. 1 viewed as indicated by arrows;

Fig. 3 is a vertical section on line 3-3 of Fig. 1, viewed as indicated by arrows;

Fig. 4 is a vertical section on line 44 of Fig. 1, viewed as indicated by arrows;

Fig. 5 is a top plan view of a gear box forming an element of the construction illustrated; and

Fig. 6 is a top plan view of the cover of the gear box.

A reference character applied to desig nate a given part indicates said part throughout the several figures of the draws ing, wherever the same appears.

A represents a plate which is provided with journal or bearing B. X represents the well pipe. Plate A 1s secured in place on pipe X by bolts a, a, wh ch extend through plate A and through an addltlonal Specification of Letters Patent.

Patented ma a, 1922. Serial no. 510,480.

plate or strap 'on the opposite side of pipe The exact manner of securing plate A to p pe X forms no material part of the invent on and I do not limit myself to the spec1fic means employed. C represents a crank shaft which is rotatably mounted in bearlng B. D, D represent crank arms which are rigidly secured on shaft C to turn therewith. d, 65 d represent apertures in crank arms D, D and E, E represent wrist pins which are secured, as by heads e and nuts 6 in crank arms D, D F, F respectivelyrepresent a pitman, mounted on wrist pin E, E atthe lower end of each; thereof, and additionally mounted on cross bar 7 at the upper end of each of said .pitmen; and Gr represents the pump rod to which the cross bar f is secured.

The position of wrist pins E, E in apertures d, al 6Z2, in the crank arms D, D determines the rectilinear movement, or throw, of pump rod G; and said position is controlled by the force required. to lift the pump rod to perform its work.

Plate A is provided with horizontal table H which is illustrated as integral therewith, and I represents an angle'iron which is rigidly attached to plate A and table H, by bolts 72,, 7t. J represents a gear box or gear case and J a vertical rib on the under side thereof, which is illustrated as integral therewith. Gear box J is rigidly attached to angle iron I, as by bolts h M. K, K, represent journals or hearings on the side walls of gear box J, which are in axial line with journal or bearing B on plate'A, and. 7c, 70, represent additional journals or bearings on the side walls of box J. Bearings K, K, and 70, 7c, are illustrated as integral with the side walls of gear box or casing J. J represents the cover of gear box J. L represents a table on one of the end walls of gear box J, said table extending on one side of the gear box. M represents a shaft which is rotatably mounted in bearings K, K, and m, a gear wheel. which is rigidly secured on shaft M. N represents a shaft which is rotatably mounted in bearings 70, 7s, and n a gear pinion which is rigidly secured on shaft N, to mesh with the gear teeth on gear wheel m. 0 represents a sprocket wheel which is rigidly secured on shaft N. P represents a sprocket chain, which extends over sprocket wheel U and over pinion sprocket Q of the electric motor S represents a crank arm which is rigidly secured on shaft M, and T a slot in said crank arm.

The wrist pin E is made sufliciently long to extend through the slot T in crank arm S. Shafts C and M being in axial line, the rotation of shaft M by motor R and the sprocket wheel O and gear wheel at, will cause the crank arm S to move crank arm D shaft G and crank arm D in unison therewith, and the movement of the shaft C and crank arms D, D will produce rectilinear movement of the pitmen F, F thereby operating the pump rod G.

The cover J extends beyond the vertical wall of the gear box J to over the end of the table L on which the motor R is positioned and the side of said cover which is adjacent to sprocket wheel extencs downward to table L, and on the opposite side of said cover it is provided with an ear, portion of which is illustrated in Fig. 2, and indicated by broken lines in Fig. 6), which is lettered U, which also extends downward to the plane of said table L.

By the construction illustrated and described oil can be put in gear box J in sufficient quantity to come in contact with the teeth of gear wheel at, thereby lubricating said teeth, and the gear pinion n, and that none of said oil will be thrown into contact with motor R, while said motor will be protected by cover J from rain or snow; and also, that portion of table L on which the motor is positioned not coming in contact with the side of cover J or the ear U thereon, a space is left through which air may flow to and from the motor, to avoid heating thereof.

By mounting the angle iron I rigidly on the plate A, and securing the gear box J rigidly to said angle iron, in the manner illus trated and descr'bed, said angle iron forms a base which is common to said plate and said gear box, and no vibration of the plate A. or pipe X will result from the strain produced in the operation of the device, and by mounting shaft C in bearing B and turning said shaft by wrist pin E in slot T of crank arm S, a plurality of pitmen may be installed, which are connected to the cross head 7" on the pump rod G, in the usual way.

The operating mechanism of the device is protected in gear box J from the weather, and to start the device it is merely necessary to close a switch in the circuit of which the motor is an element, so that said motor will be energized; and to stop the operation the switch is opened.

I claim:

1. In a pump jack, a cross bar attached to reiaoee a pump rod, a base, a gear box and a plate rigidly attached to said base, and bearings respectively mounted on said gear box and on said plate, in combination with a plurality of shafts rotatably mounted in said bearings in axial alignment, crank arms rigidly secured on said shafts, wrist pins to said crank arms arranged so that pins to adjacent crank arms are common to both thereof, and pitmen mounted on said wrist pins and on said cross bar.

2. In a pump jack, a plate provided with a journal bearing and a gear box also provided with a journal bearing, a base, said plate and gear box rigidly mounted on said base, and means to secure said base to a pump tube, in combinationwith a shaft rotatably mounted in said journal bearing on said plate and an additional shaft rotatably mounted in said bearing in said gear box, crank arms respectively provided with a plurality of apertures in spaced relation, rigidly secured on said first named shaft,wrist pins rigidly secured in corresponding apertures, a pump rod, pitmen mounted on said wrist pins and means to connect said pitmen with said pump rod, an additional crank arm rigidly secured on said additional shaft and provided with an aperture adapted to coact with the wrist pin on the crank arm adjacent thereto in whichever one of the apertures in said crank arm said wrist pin is secured; whereby the rectilinear move,

ment of the said pump rod is controlled by the adjustment of the wrist pins in said first named crank arms and said first named crank arms are driven by said additional crank arm.

8. A plate provided with a bearing and a gear box also provided with bearings, said plate and gear box rigidly mounted on a base, in combination with a plurality of shafts rotatably mounted in said bearings in axial alignment, crank arms on said shafts and wrist pins to said crank arms, pitmen on said wrist pins, all arranged so that the turning of one of said shafts transmits the turning thereof to the other of said shafts, by means of the wrist pins common to the crank arms thereon.

4. In a pump jack, a base, a vertical plate rigidly joined to said base, means to secure said plate to the tube of a pump, a journal bearing on said plate, and a gear box rigidly secured to said base, in combination with a shaft rotatably mounted in said bearing, crank arms on the ends of said shaft to form a U-shaped member, said crank arms respectively provided with a plurality of apertures, wrist pins secured in corresponding ones of said apertures and pitmen mounted on said wrist pins, an additional shaft rotatably mounted in said gear box and extending beyond the side thereof and an additional crank arm secured on said additional shaft, lar movement of said pitmen may be varied said additional crank arm provided With an Without change of the relative position of aperture arranged to oo-act with the Wrist said shafts.

pin on the crank arm adjacent thereto in OTTO CULLMAN. Whichever one of corresponding apertures in said first named crank arms the Wrist pins thereon are secured; whereby the rectangu- Witnesses:

CHARLES TURNER BROWN, SAMUEL M. BOOTH. 

